From 4aca87515a5083ae0e31ce3177189fd43b6d05ac Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Sat, 3 Jan 2015 13:58:15 +0100
Subject: patch to Vanilla Tomato 1.28

---
 release/src/router/busybox/miscutils/chrt.c | 123 ++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 release/src/router/busybox/miscutils/chrt.c

(limited to 'release/src/router/busybox/miscutils/chrt.c')

diff --git a/release/src/router/busybox/miscutils/chrt.c b/release/src/router/busybox/miscutils/chrt.c
new file mode 100644
index 00000000..cc5660be
--- /dev/null
+++ b/release/src/router/busybox/miscutils/chrt.c
@@ -0,0 +1,123 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * chrt - manipulate real-time attributes of a process
+ * Copyright (c) 2006-2007 Bernhard Reutner-Fischer
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include <sched.h>
+#include "libbb.h"
+#ifndef _POSIX_PRIORITY_SCHEDULING
+#warning your system may be foobared
+#endif
+static const struct {
+	int policy;
+	char name[12];
+} policies[] = {
+	{SCHED_OTHER, "SCHED_OTHER"},
+	{SCHED_FIFO, "SCHED_FIFO"},
+	{SCHED_RR, "SCHED_RR"}
+};
+
+static void show_min_max(int pol)
+{
+	const char *fmt = "%s min/max priority\t: %d/%d\n\0%s not supported?\n";
+	int max, min;
+	max = sched_get_priority_max(pol);
+	min = sched_get_priority_min(pol);
+	if (max >= 0 && min >= 0)
+		printf(fmt, policies[pol].name, min, max);
+	else {
+		fmt += 29;
+		printf(fmt, policies[pol].name);
+	}
+}
+
+#define OPT_m (1<<0)
+#define OPT_p (1<<1)
+#define OPT_r (1<<2)
+#define OPT_f (1<<3)
+#define OPT_o (1<<4)
+
+int chrt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int chrt_main(int argc UNUSED_PARAM, char **argv)
+{
+	pid_t pid = 0;
+	unsigned opt;
+	struct sched_param sp;
+	char *pid_str;
+	char *priority = priority; /* for compiler */
+	const char *current_new;
+	int policy = SCHED_RR;
+
+	/* at least 1 arg; only one policy accepted */
+	opt_complementary = "-1:r--fo:f--ro:r--fo";
+	opt = getopt32(argv, "+mprfo");
+	if (opt & OPT_r)
+		policy = SCHED_RR;
+	if (opt & OPT_f)
+		policy = SCHED_FIFO;
+	if (opt & OPT_o)
+		policy = SCHED_OTHER;
+	if (opt & OPT_m) { /* print min/max */
+		show_min_max(SCHED_FIFO);
+		show_min_max(SCHED_RR);
+		show_min_max(SCHED_OTHER);
+		fflush_stdout_and_exit(EXIT_SUCCESS);
+	}
+
+	argv += optind;
+	if (opt & OPT_p) {
+		pid_str = *argv++;
+		if (*argv) { /* "-p <priority> <pid> [...]" */
+			priority = pid_str;
+			pid_str = *argv;
+		}
+		/* else "-p <pid>", and *argv == NULL */
+		pid = xatoul_range(pid_str, 1, ((unsigned)(pid_t)ULONG_MAX) >> 1);
+	} else {
+		priority = *argv++;
+		if (!*argv)
+			bb_show_usage();
+	}
+
+	current_new = "current\0new";
+	if (opt & OPT_p) {
+		int pol;
+ print_rt_info:
+		pol = sched_getscheduler(pid);
+		if (pol < 0)
+			bb_perror_msg_and_die("can't %cet pid %d's policy", 'g', pid);
+		printf("pid %d's %s scheduling policy: %s\n",
+				pid, current_new, policies[pol].name);
+		if (sched_getparam(pid, &sp))
+			bb_perror_msg_and_die("can't get pid %d's attributes", pid);
+		printf("pid %d's %s scheduling priority: %d\n",
+				pid, current_new, sp.sched_priority);
+		if (!*argv) {
+			/* Either it was just "-p <pid>",
+			 * or it was "-p <priority> <pid>" and we came here
+			 * for the second time (see goto below) */
+			return EXIT_SUCCESS;
+		}
+		*argv = NULL;
+		current_new += 8;
+	}
+
+	/* from the manpage of sched_getscheduler:
+	[...] sched_priority can have a value in the range 0 to 99.
+	[...] SCHED_OTHER or SCHED_BATCH must be assigned static priority 0.
+	[...] SCHED_FIFO or SCHED_RR can have static priority in 1..99 range.
+	*/
+	sp.sched_priority = xstrtou_range(priority, 0, policy != SCHED_OTHER ? 1 : 0, 99);
+
+	if (sched_setscheduler(pid, policy, &sp) < 0)
+		bb_perror_msg_and_die("can't %cet pid %d's policy", 's', pid);
+
+	if (!*argv) /* "-p <priority> <pid> [...]" */
+		goto print_rt_info;
+
+	BB_EXECVP(*argv, argv);
+	bb_simple_perror_msg_and_die(*argv);
+}
-- 
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